Fluid-pressure motor.



J. E. OSMER.

FLUID PRESSURE MOTOR.

APPLIOATION fILnD 00T. a, 1906.

' 'l Patented 00t.19,1909.

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Toall whom i concern:

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citizen of the United States, residing at- This invention relates to e.motor of the samegeneral form es the motor yshown und described 1nPatent No. 899,999, issued to me September 29, 1908, seid motor beingdesigned a-rticulnrly for opening end closing doors, or operatingrailway switches, and foi-.similar purposes.` The motor comprises ahlgh-pressure cylinder und a low-pressure cylinder arranged in tandem,the pistons of A seid cylinders being "arranged to move together endbeing operatively connected with ,the door or other device to be moved.

One of the objects of this invention is to produce a valve mechanismespecially adnpted for controlling motors oi the class .referred to. A

Another object is to provide means for admitting an extra amount ofpressure Huid to the low'ipressure cylinder for building up the workingpressure therein. ln the accompanying drawings, Figure'l iso.'longitudinal central section through n buidpressure motor embodyingthe features of my invention. Figs. 2, 3, and 4f are detail sectionalviews showing the -dierent positions of the valve mechanism. Fig. 5 is adetail sectional view showing the valve fece. Fig. 6 is e, viewvillustrating sin alternetive construction of the velve mechanism,

the seme being represent-ed in theposition.

correspondin to that shown in' Fig. 2.

The embo ment herein shown of my invention comprises e. high-pressurecylinder 1 end a low-pressure cy inder 2 arranged in tandem, and formed,in this instance, of an integral costing. 'llhe motor is adopted to hesecured to any suitable support by mea-ns of lugs 3 cast integral withthe cylinders 2l end 3. The pistons Il end 5 for the cylinders 1 and 2,respectively, are'ixed to' theA opposite ends of e rack her 6. Betweenits .ends the rech bar 6 is supported upon e bearing shoe 7 adjusteblymounted in the cylinder structure. Bearing lugs 8, prefer ably cestintegral with. thel cylinder'ireme, rotatably support e shaft. Seidshaft hes deed thereto e sector 10 adopted' toV mesh with thereclnbsno,the. cylinder structure having a -slotll formed! therein to receive saidsector. Upon one end of the shaft 9 is fixed e lever 12 operativelyconnected with the doorv or other device to be moved.

The vulve mechanism that controls the .passage of pressure fluid to andfrom both cylinders is locnted upon the outer end of the high-pressurecylinder 1. Upon seid cylinder 1 is s. pressure chest ladapted to bepleced in communication with suitable pipe M seid pipe being screwedvinto either the walls of seid pressure chest, the opening not usedbeing closed by a plug 1G. A port 17 is connected at one end with theinterior of the lowpressure cylinder 2 by means of the pipe 18. vAninlet port 19 and 'un exhaust Aport 2communicete with the' port 17 andopen upon the valve face The pressure chest 13 is connected with thehigh-pressure cylinder 1 by eA port 22. 4An exhaust port23 communicatesbetween the valve face 21 andthe atmosphere. A' slide vulve 24 isslidnbly mounted between guides 25 formed upon the vulve 4face-21, saidslide valve having upon its face u groove 26 adapted to .connecttheports 19 and 22, and zt groove 2T adapted to connect the ports 20 lund23. In the slide valve 21 is also formed un opening 28 extending throughsaid slide velve and located in position to be brought slide valve 24Cis reciprocated by means com prisiug n crank disk 29, said crunk diskbeing mounted upon the lower end of e vertical shaft 30 rotatably'mounted in u bearing 31 upon the upper well of the pressure chest.13.Fixed to the under side of the crank disk 29 is e cra-nkpin ladepted tolie within n transverse groove 33 in the slide vulve 24. 'lhe shaft 30is rocked to reciprocate'the slide valve 24: by means of n crunk arm 34connected in any suitable way to 'a controller (not shown) locatedwithin convenient reach of the operator.

'Assuming the parte torbe in the position shown' in Fig, .1, the oeration of the motor is as follows; The hig i-pressure cylinder 1 isconnected with the pressure. chest 13 through the port 22, and theAlow-pressure 'nder 2 is connected with the atmosphere .supply ofpressure fluid by means of an inletinto register with the exhaust port20. The

.one-of two threaded openings 15 formed in 't ough the pipe 18, the portl?, the enhenst 1 port 20, the groove 27, and the exhaust port 23. Thepistons 4 and 5 are consequently moved toward the left (Fig. 1) by thepressure of the fluid within the high-pressure cylinderl. When it isdesired to reverse the movement of'the door or other device beingoperated, the operator moves the slide valve 24 into the position shownin Fig. 4, wherein the cylinders 1 and 2 are placed in communicationwith each other through the passages 22, 26, 19, 17, and 18, equalizingthe pressures in said cylinders.` -The piston 5 in the low-pressurecylinder havinga larger area than the piston 4 in the high- -pressurecylinder, the total pressure exerted upon. the piston 5. will be greaterthan the total pressure exerted upon the piston 4, causing a 'movementof said pistons toward the right. If now it be desirable to increase thepressure in said cylinders, thq'slide valve 24 is moved to the positionshown in Fig. 3,

- causing the opening 28 to register with the port 20, and therebypermitting the 'entrance of high-pressure liuid to the cylinders l and2. The movements of the valve 24 being under the control of theoperator, said valve may be moved to admit an eXtr'a amount ofpressurefluiwd 'Whenever and in the amounts necessary. When theApressure has been augmented to the desired degree, as indicated by themovement of the'door', the operator moves the valve 24 from the positionshown in Fig. 3to that shown in Fig. 4. Such movement is suflicient tocarry the opening 28 out of register with the port 20, thereby cuttingofI the suppl y of higlrpressure fluid to the cylinders, but it is notsufficiently great to carry the groove 2G out of register with the ports19 and 22, thus leaving the cylinders l and 2 in communica tion witheach other. As will be understood, the slide valve 24 may be moved backand forth slightly to bring the opening 28 Iinto register with the port2O at intervals to build up the pressure in the cylinders as needed.

In Fig. 6 'I have illustrated a modified construction wherein the end ofthe slide valve 24 is partially cut away, as at'l, so as to ,permit ofcovering and uncovering the port 20 in the same manner as the opening 28is made to coincide with said port.

As the movements of the valve member 24 are under the direct control ofthe operator,

` he is enabled. tovmanipttlate the mechanism as required..- Toillustrate, ,it is desirable, as hereinbefore stated, to cushion orretard the movements of the door near :he ends of its travel. This maybe accomplished by slightly shifting the valve member -24 from thepositions shown in Figs. 2 and 4, thus cutting off communication to a.greater or less extent between the low-pressure cylinder and the exhaustor between the high-pres- 0 sure cylinder and the low-pressure cylinder.

The escape of the air contained in the space in front of the advancingpiston being thus retarded, the movement of the door near the theoorivay. The same result may be obtained by making the inlet ort 22- andthe exhaust port 23 quite smal or restricted.

When high-pressure fluid is admitted to the 4high-pressure cylinder 1,the exhaust from the low-pressure cylinder 2 will be somewhatchoked,thus providing a cushion near the end of the travel of the pistonstoward the left, Fig. l. Constricting the passage 22 results in asimilar eifect when the pistons 1 and 2 are placed in communication witheach other and the pistons are traveling toward the right, Fig. 1.

- I claim as my invention:

1. In a fluid pressure motor, in combination, anintermittently-operating cylinder; two sources of pressure Huid atvarying pressures; and a distributing'valve mechanism for said cylindercontrolled by the operator and movable through variable distances byt-he operator, and adapted to connect said cylinder with either of saidsources of pressure fluid.

2. In a fluid pressure motor, in combination, a high-pressure cylinderand a lowpressure cylinder said cylinders operating intermittently; a`pressure chest; a valve mechanism comprising a slide valve in saidpressure chest, the movements of said valve being controlled by theoperator, and said slide valve being reciprocablc through vari-i abledistances by the operator, said mechanism comprising means forconnecting said high-pressure cylinder with said pressure chest, and forconnecting said cylinders together, said mechanism also comprising meansfor connecting said low-pressure cylinder with said pressure chest.

3. In a fluid pressure motor, in combination, a high-pressure cylinderand la lowpressure cylinder; a pressure chest; and a valve mechanismcomprising a slide valve in said pressure chest; a valve face, saidvalve face being connected with said cylinders by means of ports, .saidslide valve having a groove adapted tol connect said ports, said slidevalve also being adapted to permit the passage of fluid from saidvpressure chest to said ports while said ports are connected together bysaid groove.

4. In a fluid pressure motor, in combination, a high-pressure cylinderand a 10W- pressure cylinder said cylinders operating intermittently;and a single valve member movable variable distances by the operator forplacing said high-pressure cylinder in communication with a source ofpressure fiuid, for connecting said cylindnrs together, and forconnecting said low-pressure cylinilo e der with the exhaust, saidmember also being in; and a slide valve having a groove therein adaptedto connect said low-pressure cylinadapted to connect said firstmentioned' inlet der with the source of pressure vfluid. port with oneof the last mentioned ports,

' 5. The combination, Wlth 'two cylinders,` said valve also havingagroove adapted to 5 one of said cylinders having a valve face ,connectthe other of said last mentioned inlet thereon,y one 'of said vcylinderscommunicat.- ports With said exhaust port. n

ing with said Valve face by means of an inlet IJOHN E. OSMER. port, theother cylinder communicating with .VVtnessesx said valve face by meansof tWo inlet ports, L. L. MILLER,

le said valve face having an exhaust port therei GEORGE L. CHINDAHL.

